1166772665 has 8 divisors (see below), whose sum is σ = 1404095688. Its totient is φ = 930772480.

The previous prime is 1166772647. The next prime is 1166772667. The reversal of 1166772665 is 5662776611.

It can be written as a sum of positive squares in 4 ways, for example, as 221087161 + 945685504 = 14869^2 + 30752^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1166772665 - 2⁶ = 1166772601 is a prime.

It is a super-2 number, since 2×1166772665² = 2722716903582404450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166772667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328766 + ... + 332295.

It is an arithmetic number, because the mean of its divisors is an integer number (175511961).

Almost surely, 2^1166772665 is an apocalyptic number.

It is an amenable number.

1166772665 is a deficient number, since it is larger than the sum of its proper divisors (237323023).

1166772665 is an equidigital number, since it uses as much as digits as its factorization.

1166772665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661419.

The product of its digits is 635040, while the sum is 47.

The square root of 1166772665 is about 34158.0541746745. The cubic root of 1166772665 is about 1052.7584807196.

The spelling of 1166772665 in words is "one billion, one hundred sixty-six million, seven hundred seventy-two thousand, six hundred sixty-five".